CN113834046A - Enthalpy-enhanced steam purification recovery process for sewage water of power plant - Google Patents
Enthalpy-enhanced steam purification recovery process for sewage water of power plant Download PDFInfo
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- CN113834046A CN113834046A CN202111300073.9A CN202111300073A CN113834046A CN 113834046 A CN113834046 A CN 113834046A CN 202111300073 A CN202111300073 A CN 202111300073A CN 113834046 A CN113834046 A CN 113834046A
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- 238000000746 purification Methods 0.000 title claims abstract description 271
- 239000010865 sewage Substances 0.000 title claims abstract description 136
- 238000011084 recovery Methods 0.000 title claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 32
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000002955 isolation Methods 0.000 claims description 49
- 238000011010 flushing procedure Methods 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000010926 purge Methods 0.000 claims description 8
- 230000008929 regeneration Effects 0.000 claims description 8
- 238000011069 regeneration method Methods 0.000 claims description 8
- 238000010792 warming Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 15
- 238000004140 cleaning Methods 0.000 description 5
- 238000004064 recycling Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000013020 steam cleaning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/08—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/16—Control systems for steam boilers for steam boilers of forced-flow type responsive to the percentage of steam in the mixture of steam and water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/02—Other direct-contact heat-exchange apparatus the heat-exchange media both being gases or vapours
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a process for increasing the enthalpy of sewage discharged by a power plant and purifying and recovering steam, which comprises the following steps: the recovery and purification system atomizes the external sewage and mixes the atomized external sewage with high-temperature steam to vaporize the external sewage to form sewage mixed steam, and the sewage mixed steam enters the steam purification module to be purified; the temperature, the air pressure and the steam quality at the inlet and the outlet of the steam purification module are detected by the temperature detection element, the air pressure detection element and the steam quality detection element, and the amount of sewage entering the steam purification module is adjusted according to the temperature, the air pressure and the steam quality at the outlet of the steam purification module; the process is reasonable, and the amount of sewage entering the steam purification module is adjusted according to the temperature of the high-quality pure steam obtained after purification, so that the steam purification module can completely recover the heat in the sewage entering the steam purification module, and the recovery efficiency of the heat energy is improved.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a process for increasing the enthalpy of sewage discharged by a power plant and purifying and recovering steam.
Background
The whole recovery and utilization of low-grade waste heat are always a problem which troubles the energy-saving industry. The low recovery rate, low use and low use are the current general current situation of the industry.
Boiler pollution discharge is divided into two types: and (3) periodic pollution discharge and continuous pollution discharge, wherein the periodic pollution discharge rate and the pollution discharge amount of the boiler are mainly determined according to the change of the concentration (total alkalinity index) of the boiler water, so that the concentration (the total alkalinity index content) of the boiler water is reduced. Continuous blowdown is carried out on boilers by using the pH value of boiler water to be acidic and the pH value of boiler water to be alkaline or the content of chloride of boiler water, and is also called surface blowdown. Regardless of the mode of pollution discharge, the boiler pollution discharge work can be finished only by performing test work (water quality analysis and test) on each index of boiler water, the concentration of the boiler water can be ensured within the water quality standard range, and the boiler pollution discharge is important heat loss in the operation of the boiler. In order to control the quality of the boiler steam, the boiler needs to continuously discharge sewage and regularly discharge sewage, namely, the boiler continuously discharges partial boiler water from the part with the highest saline-alkali concentration of the boiler water so as to reduce the salt content, the alkali content, the silicate content and the slag content in a suspended state in the boiler water. The purpose is to ensure the quality of boiler water to ensure the boiler to stably and safely operate for a long time, and the heat loss of the blowdown is also one of the important factors influencing the heat efficiency of the boiler.
At present, the existing blowdown heat recovery technology of the boiler has: flashing by a continuous discharge flash tank and recovering by a heat exchanger, wherein the recovery amount of the continuous discharge flash tank is only about 15 percent; if the heat exchanger is used for recycling, the heat level can be reduced to about 50 percent, but the heat exchanger cannot be used under the condition of not having enough cold sources. In view of the above problems, a solution is proposed as follows.
Disclosure of Invention
The invention aims to provide a process for enthalpy-enhanced steam purification and recovery of sewage discharged by a power plant, which has the advantages of completely recovering high-temperature sewage discharged by a boiler, converting the high-temperature sewage into high-grade steam for use and thoroughly solving the problem of pollution discharge loss of the boiler.
The technical purpose of the invention is realized by the following technical scheme:
a process for increasing enthalpy and purifying and recovering steam of sewage discharged by a power plant comprises the following steps:
closing a first valve for enabling sewage to enter a sewage discharge flash tank, blocking a channel for enabling the sewage to enter an original system, opening a second valve for enabling the sewage to enter a recovery and purification system, opening a channel for enabling the sewage to enter the recovery and purification system, enabling the recovery and purification system to atomize external sewage and mix the external sewage with high-temperature steam, absorbing superheat degree of the high-temperature steam, enabling enthalpy of the external sewage to be increased and vaporized, and forming sewage mixed steam, wherein the recovery and purification system comprises a plurality of steam purification modules, enabling the sewage mixed steam to enter the steam purification modules for purification, and outputting high-quality pure steam to be conveyed to a hot user;
the inlet end and the outlet end of the steam purification module are respectively provided with a temperature detection element, an air pressure detection element and a steam quality detection element, the temperature, the air pressure and the steam quality of the inlet end and the outlet end of the steam purification module are detected through the temperature detection element, the air pressure detection element and the steam quality detection element, and the recoverable sewage quantity entering the steam purification module is adjusted according to the temperature, the air pressure and the steam quality of the outlet of the steam purification module;
when the pressure difference between the front and the back of the steam purification module reaches a set value, starting the standby steam purification module, stopping the steam purification module in use, and enabling the sewage mixed steam to enter the standby steam purification module;
the steam purification module is provided with a back flush purging regeneration unit, the back flush purging regeneration unit performs flushing purging regeneration on the steam purification module when the steam purification module is out of service, and the recovery unit arranged on the steam purification module collects impurities which are flushed and purged.
Preferably, a plurality of sets of steam purification modules are arranged in the recovery purification system and run independently, a front isolation valve and a rear isolation valve are arranged at the inlet end and the outlet end of each set of steam purification module respectively, a bypass branch pipe is further arranged in the recovery purification system and runs independently from the plurality of steam purification modules, and a branch isolation valve is arranged on the bypass branch pipe.
Preferably, a plurality of sets of steam purification modules are arranged in the recovery purification system and run independently, each set of steam purification module is provided with a front isolation valve and a rear isolation valve at the inlet end and the outlet end respectively, a recovery system bypass branch pipe and a branch isolation valve are further arranged in the recovery purification system, all the isolation valves are provided with heating pipe bypass valves, and the bypass branch pipe and the plurality of steam purification modules run independently.
Preferably, the use of the steam purification module comprises a cold start and a hot start, the cold start comprising the steps of:
opening a drain valve on the steam purification module, a warm pipe bypass valve on a front isolation valve and a back isolation valve of the steam purification module, opening a warm pipe warming machine according to requirements, after the warm pipe warming machine finishes warming and boosting the steam purification module, opening the front isolation valve and the back isolation valve on the steam purification module, closing the drain valve and the warm pipe bypass valve in the steam purification module, and closing a branch isolation valve on a bypass branch pipe of a recovery system;
checking the pressure difference condition of each part on the steam purification module, and putting sewage into the steam purification module when the pressure on the steam purification module is confirmed to meet the requirement;
opening front and rear isolation valves at the inlet end and the outlet end of the steam purification module, closely checking the temperature change in the steam purification module displayed on the temperature detection element, and adding sewage according to the temperature change condition until the front and rear isolation valves are fully opened;
and adjusting the opening of the second valve until the sewage is completely put into the recovery and purification system according to the requirement, and closing the first valve at one side of the sewage discharge flash tank.
Preferably, the use of the steam purification module further comprises a hot start mode, and the hot start mode comprises the following steps:
opening front and rear isolation valves at the inlet end and the outlet end of the steam purification module, closely checking the temperature change in the steam purification module displayed on the temperature detection element, and adding sewage according to the temperature change condition;
and adjusting the opening of the second valve until the sewage is completely put into the recovery and purification system according to the requirement, and closing the first valve at one side of the sewage discharge flash tank.
Preferably, the recycling and purifying system is further internally provided with a control module, when the temperature, the air pressure and the steam quality at the outlet of the steam purifying module are lower than a standard set value, the control module increases the opening of the first valve, reduces the opening of the second valve, and reduces the amount of the external sewage entering the recycling and purifying system, and when the temperature, the air pressure and the steam quality at the outlet of the steam purifying module are higher than the standard set value, the control module decreases the opening of the first valve, increases the opening of the second valve, and increases the amount of the external sewage entering the recycling and purifying system.
The invention has the beneficial effects that: the sewage generated in the boiler enters a recovery purification system through a pipeline, atomization is carried out in the recovery purification system, the atomized sewage is mixed with high-temperature steam and then vaporized to form sewage mixed steam, the sewage mixed steam enters a steam purification module, the steam purification module purifies the sewage mixed steam, the generated pure high-temperature steam is provided for a heat user, and when the temperature of the high-temperature steam generated by the steam purification module does not meet the requirement, the amount of the sewage mixed steam entering the recovery purification system and a sewage discharge flash tank can be changed by distributing the amount of the sewage entering the recovery purification system and the sewage discharge flash tank, so that the temperature of the high-temperature steam generated by the steam purification module can be adjusted to meet the requirement of the user; the steam purification module can lead to the decline of its throughput for a long time of use, can switch to reserve steam purification module, and wash the steam purification module that stops using, every set of steam purification module entrance point all is equipped with preceding isolating valve, when the unable time of admitting air of the entrance point of one set of steam purification module, can open another set of steam purification module's preceding isolating valve voluntarily, when the front end of all steam purification modules can't admit air, can open the last isolating valve of bypass branch pipe, if the bypass branch pipe also blocks up unable ventilation, can open valve one, make sewage enter into the blowdown flash tank completely, guarantee the safe operation of device.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
Reference numerals: 1. a blowdown flash tank; 2. a steam purification module; 3. a detection element; 4. a recovery unit; 5. a bypass branch pipe; 6. a branch isolation valve; 7. a front isolation valve; 8. a rear isolation valve; 9. a boiler.
Detailed Description
The following description is only a preferred embodiment of the present invention, and the protection scope is not limited to the embodiment, and any technical solution that falls under the idea of the present invention should fall within the protection scope of the present invention. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in figure 1, the enthalpy-enhanced steam purification recovery process for the sewage of the power plant comprises the following steps:
sewage purification treatment: firstly, a first valve for sewage to enter the sewage flash tank 1 is closed, and a channel for sewage to enter the sewage flash tank 1 is cut off. And then opening a second valve at one side of the recovery and purification system to ensure that all the sewage discharged by the boiler 9 and the like enters the recovery and purification system. The atomizer blowout of sewage from retrieving among the clean system to with the high temperature steam mixture that the external world lets in, sewage after the atomizing can the flash evaporation for sewage mist steam, dissolve originally that most ion in the sewage can be followed sewage mist steam with the mode of crystallization and is appeared.
The recovery purification system is internally provided with a plurality of sets of steam purification modules 2, and each set of steam purification module 2 operates independently. The inlet end of each set of steam purification module 2 is provided with a front isolating valve 7, and the outlet end is provided with a rear isolating valve 8. The mixed steam of the sewage enters one or more sets of steam purification modules 2 from the inlet end and is purified in the steam purification modules 2.
The purification steps in the steam purification module 2 comprise three steps of cyclone separation, filler adsorption and precise filtration, the three steps are general steps for sewage purification, and other targeted steps can be added according to impurities contained in the actually treated sewage. The steam after purifying through steam purification module 2 is high-quality pure steam, according to the user's demand, carries high-quality pure steam to hot user department.
A high-quality pure steam temperature adjusting step:
the inlet end and the outlet end of the steam purification module 2 are both provided with detection elements 3, the detection elements 3 comprise a temperature detection element 3, an air pressure detection element 3 and a steam quality detection element 3, and other detection elements 3, such as a flow detection element 3, can be added according to requirements. The sensing elements 3 are capable of sensing the temperature, pressure and quality of the steam at the inlet and outlet ends of the steam cleaning module 2. The standard temperature of the inlet end and the standard temperature of the outlet end are preset according to requirements.
The set value of the standard temperature at the outlet end of the steam purification module 2 is more than 5 ℃ higher than the set value of the standard temperature at the inlet end.
When the temperature of the high-quality pure steam at the outlet end of the steam purification module 2 is lower than a set value, the opening of the second valve is closed, the opening of the first valve is increased, part of sewage enters the sewage discharge flash tank 1 for original treatment, and the amount of sewage entering the recovery and purification system is reduced, so that the high-temperature steam can completely vaporize the sewage entering the recovery and purification system, and the temperature of the high-quality pure steam at the outlet end of the steam purification module 2 is increased to the set value.
When the temperature of the high-quality pure steam at the outlet end of the steam purification module 2 is higher than the set value, the opening of the second valve is increased, the opening of the first valve is decreased, the amount of sewage entering the recovery and purification system is increased, and finally the temperature of the high-quality pure steam output from the outlet end of the steam purification module 2 is reduced to reach the set value.
And 2, switching the steam purification module:
the pressure difference value between the inlet end and the outlet end of the steam purification module 2 is set according to the actual situation, such as 0.06 MPa. When the pressure difference value between the inlet end and the outlet end of the steam purification module 2 reaches a set value, the steam purification module 2 is stopped, and the standby steam purification module 2 is started.
When the steam purification module 2 is switched, the front isolation valve 7 and the rear isolation valve 8 on the standby steam purification module 2 are firstly opened, so that the sewage mixed steam enters the standby steam purification module 2 for purification, after the temperature and the pressure in the standby steam purification module 2 are stable, the front isolation valve 7 on the steam purification module 2 needing to be stopped is closed, the rear isolation valve 8 on the steam purification module 2 needing to be stopped is closed, and finally the drain valve on the steam purification module 2 needing to be stopped is opened.
The steam purification module 2 is started in two ways, namely cold-state starting and hot-state starting, and when the inside of the steam purification module 2 reaches the starting temperature, the hot-state starting way is selected:
directly opening a front isolation valve 7 at the inlet end and a rear isolation valve 8 at the outlet end of the steam purification module 2, closely checking the temperature change in the steam purification module 2 displayed on the temperature detection element 3, properly adding sewage according to the temperature change condition, and paying attention to the fact that water hammer cannot occur when the sewage is added;
and gradually adjusting the opening of the second valve according to the requirement of a hot user until the sewage is completely put into the recovery and purification system, and finally closing the first valve on one side of the sewage flash tank 1.
When the steam purification module 2 is in a normal temperature or low temperature state, a cold starting mode needs to be selected:
opening a drain valve on the steam purification module 2, a front isolation valve 7 at the inlet end of the steam purification module 2 and a rear isolation valve 8 at the outlet end, then slowly opening a warm pipe at the inlet end of the steam purification module 2, wherein the warm pipe can transfer heat to the steam purification module 2, so that the steam purification module 2 is heated and pressurized, and after the warm pipe finishes heating and pressurizing the steam purification module 2, closing a drain door in the steam purification module 2;
checking the pressure difference condition of each part on the steam purification module 2, and when the pressure on the steam purification module 2 is confirmed to meet the requirement, putting sewage into the steam purification module 2;
after the pipe warming is finished, according to the hot starting mode, the front and rear isolating valves 8 at the inlet end and the outlet end of the steam purification module 2 are opened, the temperature change in the steam purification module 2 displayed on the temperature detection element 3 is closely checked, and sewage is added according to the temperature change condition;
and adjusting the opening of the second valve until the sewage is completely put into the recovery and purification system according to the requirement, and closing the first valve on one side of the sewage discharge flash tank 1.
The steam purification module 2 is provided with a back washing purging regeneration unit, the back washing purging regeneration unit is used for cleaning the steam purification module 2, and the steam purification module 2 cleaning step comprises the following steps:
when the whole temperature of the steam purification module 2 which is stopped using is reduced to be equal to the environmental temperature, introducing demineralized water into the steam purification module 2, closing valves such as a drain valve, a drain valve and the like on the steam purification module 2, only opening an overflow valve on the steam purification module 2, and closing a feeding port of the demineralized water when the demineralized water overflows from the overflow valve;
starting a heating valve at the bottom of the steam purification module 2, heating the demineralized water until the temperature of the demineralized water rises to about 100 ℃, soaking the steam purification module for 2 three to five hours by using the demineralized water, starting a drain valve to discharge the demineralized water and impurities after soaking is finished, and closing the drain valve after the demineralized water is completely discharged;
opening a rear isolation valve 8 of the steam purification module 2, opening a blow-down valve, introducing steam into the steam purification module 2 through the blow-down valve, performing back flushing on the filter element in the steam purification module 2, wherein the opening time of each blow-down valve is 1 minute, namely the time of each back flushing is 1 minute, and continuously performing 5-6 times of back flushing;
and after the back flushing is finished, introducing steam into the steam purification module 2 by using all valves on the upper part of the steam purification module 2, flushing for 5-6 times continuously, wherein the flushing time is 1 minute each time.
After the sweeping is finished, the cleaning of the steam purification module 2 is finished, and the recovery unit 4 arranged on the steam purification module 2 collects the impurities washed down. The steam purification module 2 which is just cleaned can be directly started in a hot starting mode.
The recovery purification system is provided with a bypass branch pipe 5 and a plurality of sets of steam purification modules 2, and the bypass branch pipe 5 and the plurality of sets of steam purification modules 2 can independently run without interference. The inlet end and the outlet end of each set of steam purification module 2 are respectively and independently provided with a front isolation valve 7 and a rear isolation valve 8, and the bypass branch pipe 5 is provided with a branch isolation valve 6.
The recovery purification system is internally provided with safe operation logic, when one set of steam purification module 2 cannot ventilate, the standby steam purification module 2 can automatically open the front isolation valve 7 and the rear isolation valve 8, so that sewage and waste gas are treated in the standby steam purification module 2.
The working principle is as follows: the whole process is divided into four major processes, wherein the first process is a sewage purification process, after sewage is discharged from the boiler 9, a pipeline which originally enters the sewage flash tank 1 is closed, the sewage enters the recovery and purification system through the valve II, and the recovery and purification system atomizes the sewage, mixes the sewage with high-temperature steam and vaporizes the sewage into sewage mixed steam. The sewage mixed steam enters the steam purification module 2 for purification treatment, and the high-quality pure steam after treatment is discharged from the outlet end of the steam purification module 2 and is transmitted to a hot user.
In the purification process of sewage, a plurality of sets of steam purification modules 2 are arranged in the recovery purification system, each set of steam purification module 2 can work independently, and each set of steam purification module 2 has an independent valve unit. One or more sets of steam purification modules 2 can be selected to work simultaneously according to the amount of the sewage discharged by the boiler 9. The steam purification module 2 sequentially carries out three steps of cyclone separation, filler adsorption and precise filtration on the sewage mixed steam, and can also add a new purification step according to different substances in the sewage.
The outlet end and the inlet end of the steam purification module 2 are provided with detection elements 3, the detection elements 3 can detect the temperature, the air pressure and the steam quality in the steam purification module 2, when the air pressure difference value of the outlet end and the inlet end of the steam purification module 2 reaches a set value, the steam purification module 2 in use needs to be stopped, and the standby steam purification module 2 is started.
When the steam purification module 2 is switched, the front isolation valve 7 and the rear isolation valve 8 on the standby steam purification module 2 are firstly opened, so that the sewage mixed steam enters the standby steam purification module 2 for purification. After the temperature and the pressure in the standby steam purification module 2 are stable, the front isolation valve 7 on the steam purification module 2 to be stopped is closed, the rear isolation valve 8 on the steam purification module 2 to be stopped is closed, and finally the drain valve on the steam purification module 2 to be stopped is opened, so that the switching of the steam purification module 2 is completed.
The second set of process is a high-quality pure steam temperature adjusting process discharged from the outlet end of the steam purification module 2. The detecting elements 3 at the outlet end and the inlet end of the steam purifying module 2 include a temperature detecting element 3 and a pressure detecting element 3, and other detecting elements 3, such as a flow detecting element 3, may be added during the manufacturing process. The detection elements 3 at the inlet end and the outlet end of the steam purification module 2 are set, and a set value is set for the temperature detection element 3 at the outlet end according to requirements.
When the temperature monitor at the outlet end detects that the temperature of the high-quality pure steam discharged by the steam purification module 2 is lower than a set value, the opening of a first valve leading to the sewage discharge flash tank 1 is opened, and the opening of a second valve leading to the recovery purification system is closed, so that the amount of sewage flowing into the recovery purification system is reduced, the high-temperature steam can completely vaporize the sewage entering the recovery purification system, the temperature of the mixed sewage steam is increased, and the temperature of the high-quality pure steam finally processed by the steam purification module 2 is increased to the set value.
When the temperature monitor at the outlet end detects that the temperature of the high-quality pure steam discharged by the steam purification module 2 is higher than a set value, the opening of the first valve communicated with the blowdown flash tank 1 is reduced, the opening of the second valve communicated with the recovery purification system is increased, the amount of sewage flowing into the blowdown flash tank 1 is reduced, the amount of sewage flowing into the recovery purification system is increased, the temperature of the sewage mixed steam vaporized by the high-temperature steam is reduced, and finally the temperature of the high-quality pure steam processed by the steam purification module 2 is reduced to the set value.
The third set of process is a safe process for the operation of the recovery and purification system. When the steam purification module 2 in use cannot ventilate, the steam purification module 2 is automatically switched to another set of steam purification module 2 to reciprocate. If all the steam purification modules 2 cannot ventilate, the branch isolation valve 6 on the bypass branch pipe 5 is opened, so that the sewage mixed steam is discharged from the bypass branch pipe 5 to be decompressed, and damage or explosion caused by overhigh air pressure in the recovery and purification system is prevented.
When the bypass branch pipe 5 can not be ventilated, the first valve is opened, the second valve is closed, so that the sewage discharged by the boiler 9 can not enter the recovery and purification system, and the sewage can completely enter the sewage discharge flash tank 1 for treatment. At the same time, the recovery purification system can be repaired.
The fourth set of processes is a cleaning process of the steam purification module 2. When the pressure difference value between the two ends of the steam purification module 2 reaches a set value, the steam purification module 2 is switched, and after the switching is completed, the steam purification module 2 which is just stopped needs to be cleaned.
When the whole temperature of the steam purification module 2 which is stopped using is reduced to be equal to the ambient temperature, the demineralized water is introduced into the steam purification module 2, valves such as a drain valve and a drain valve on the steam purification module 2 are closed, only an overflow valve on the steam purification module 2 is opened, and when the demineralized water overflows from the overflow valve, a feeding port of the demineralized water is closed.
And (3) opening a heating valve at the bottom of the steam purification module 2, heating the demineralized water until the temperature of the demineralized water rises to about 100 ℃, soaking the steam purification module for 2 three to five hours by using the demineralized water, opening a drain valve to discharge the demineralized water and impurities after soaking is finished, and closing the drain valve after the demineralized water is completely discharged.
And (3) opening a rear isolation valve 8 of the steam purification module 2, opening a blow-down valve, introducing steam into the steam purification module 2 through the blow-down valve, carrying out back flushing on the filter element in the steam purification module 2, wherein the back flushing time is 1 minute each time, and continuously carrying out 5-6 times of back flushing.
And after the back flushing is finished, introducing steam into the steam purification module 2 by using all valves on the upper part of the steam purification module 2, flushing for 5-6 times continuously, wherein the flushing time is 1 minute each time. After the flushing, the cleaning of the steam purification module 2 is completed.
The whole set of sewage treatment process can carry out nearly hundred percent recovery to the heat in the sewage when normally working, improves the recovery efficiency of the heat, and can adjust the temperature of the pure steam of the high quality of exhaust, makes it accord with the demand of hot user. The steam purification module 2 runs independently, when one set of the steam purification module is out of service, the other set of the steam purification module can be in seamless butt joint to frequently treat mixed sewage steam, and the out of service set can be cleaned or maintained independently, so that the recovery purification system can continuously treat sewage without stopping, and the efficiency of sewage treatment is improved. And finally, the safety operation logic in the recovery and purification system can also ensure the safety operation of the recovery and purification system, the conditions of internal high pressure and the like can not occur, and the safety is ensured.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The enthalpy-enhanced steam purification recovery process for the sewage of the power plant is characterized by comprising the following steps of:
closing a first valve for enabling sewage to enter a sewage discharge flash tank (1), blocking a passage for enabling the sewage to enter an original system, opening a second valve for enabling the sewage to enter a recovery and purification system, opening a passage for enabling the sewage to enter the recovery and purification system, enabling the recovery and purification system to atomize external sewage and mix the atomized external sewage with high-temperature steam, absorbing the superheat degree of the high-temperature steam, enabling the enthalpy of the external sewage to be increased and vaporized to form sewage mixed steam, enabling the sewage mixed steam to enter a steam purification module (2) for purification, and outputting high-quality pure steam to be conveyed to a hot user;
the inlet end and the outlet end of the steam purification module (2) are respectively provided with a temperature detection element (3), an air pressure detection element (3) and a steam quality detection element (3), the temperature, the air pressure and the steam quality of the inlet end and the outlet end of the steam purification module (2) are detected through the temperature detection element (3), the air pressure detection element (3) and the steam quality detection element (3), and the recoverable sewage amount entering the steam purification module (2) is regulated according to the temperature, the air pressure and the steam quality of the outlet of the steam purification module (2);
when the pressure difference between the front and the back of the steam purification module (2) reaches a set value, starting the standby steam purification module (2), stopping the steam purification module (2) in use, and enabling the sewage mixed steam to enter the standby steam purification module (2);
the steam purification module (2) is provided with a back flushing purging regeneration unit, the back flushing purging regeneration unit performs flushing purging regeneration on the steam purification module (2) when the steam purification module (2) is stopped, and the recovery unit (4) arranged on the steam purification module (2) collects impurities which are flushed and purged.
2. The enthalpy-increasing steam purification recovery process for sewage from power plants according to claim 1, characterized in that a plurality of sets of steam purification modules (2) are arranged in the recovery purification system, the plurality of sets of steam purification modules (2) operate independently, each set of the steam purification module (2) is provided with a front isolation valve (7) and a rear isolation valve (8) at the inlet end and the outlet end respectively, the recovery purification system is further provided with a recovery system bypass branch pipe (5) and a branch isolation valve (6), all the isolation valves are provided with warm pipe bypass valves, and the bypass branch pipe (5) and the plurality of steam purification modules (2) operate independently.
3. The enthalpy-enhanced steam purification recovery process for sewage from power plants according to claim 1, characterized in that the use of the steam purification module (2) comprises a cold start and a hot start, the cold start comprising the following steps:
opening a drain valve on the steam purification module (2), a front isolation valve (7) of the steam purification module (2) and a heating pipe bypass valve on a rear isolation valve (8), opening a heating pipe warming machine according to requirements, after the heating pipe warming machine finishes warming and boosting the steam purification module (2), opening the front isolation valve (7) and the rear isolation valve (8) on the steam purification module (2), closing a drain door and the heating pipe bypass valve in the steam purification module (2), and closing a branch isolation valve (6) on a bypass branch pipe (5) of a recovery system;
checking the pressure difference condition of each part on the steam purification module (2), and putting sewage into the steam purification module (2) when the pressure on the steam purification module (2) is confirmed to meet the requirement;
opening front and rear isolation valves (8) at the inlet end and the outlet end of the steam purification module (2), closely checking the temperature change in the steam purification module (2) displayed on the temperature detection element (3), and adding sewage according to the temperature change condition until the front and rear isolation valves (8) are fully opened;
and adjusting the opening of the second valve until the sewage is completely put into the recovery and purification system according to the requirement, and closing the first valve at one side of the sewage discharge flash tank (1).
4. The enthalpy-enhanced steam purification recovery process for sewage from power plants according to claim 3, wherein the use of the steam purification module (2) further comprises a hot start mode, the hot start mode comprising the steps of:
opening front and rear isolating valves (8) at the inlet end and the outlet end of the steam purification module (2), closely checking the temperature change in the steam purification module (2) displayed on the temperature detection element (3), and adding sewage according to the temperature change condition;
and adjusting the opening of the second valve until the sewage is completely put into the recovery and purification system according to the requirement, and closing the first valve at one side of the sewage discharge flash tank (1).
5. The enthalpy-increasing steam purification recovery process for the sewage discharged by the power plant as claimed in claim 1, characterized in that a control module is further arranged in the recovery purification system, when the temperature, the air pressure and the steam quality at the outlet of the steam purification module (2) are lower than a standard set value, the control module increases the opening of the first valve, reduces the opening of the second valve, reduces the amount of external sewage entering the recovery purification system, and when the temperature, the air pressure and the steam quality at the outlet of the steam purification module (2) are higher than the standard set value, the control module reduces the opening of the first valve, increases the opening of the second valve, and increases the internal amount of external sewage entering the recovery purification system.
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